diff --git a/synapse/handlers/e2e_room_keys.py b/synapse/handlers/e2e_room_keys.py
index 6c43c9db7..546050f8e 100644
--- a/synapse/handlers/e2e_room_keys.py
+++ b/synapse/handlers/e2e_room_keys.py
@@ -24,7 +24,7 @@ from synapse.api.errors import (
     NotFoundError,
     RoomKeysVersionError,
     StoreError,
-    SynapseError
+    SynapseError,
 )
 from synapse.util.async_helpers import Linearizer